Linux kernel 4.1.2 brings dozens of improvements to the ARM architecture. Additionally, there’s also some improvements to the s390 and x86 architectures, several updated drivers, especially for things like CPUFreq, CPUIdle, IOMMU, MMC, USB, KVM, and Ethernet (mostly for Mellanox hardware), improvements to the Unix File System (UFS), various networking fixes (mostly for IPv4), and some security enhancements.